Supplementary cementitious materials comprising dredged sediments
AssigneeFlemish Government, Department of Public Works, Maritime Access
InventorsJoris Dockx, Jos Vandekeybus, Ruben Snellings, Liesbeth Horckmans, Ozlem Cizer, Lucie Vanderwalle, Koen Van Balen
Life of this patent
Estimating the term…
Abstract
A supplementary cementitious material used in combination with an activator such as Portland cement to produce a hydraulic binder. The supplementary cementitious material is based on physico-chemically treated filter cake product extracted from dredged sediments and can partially replace Portland cement clinker in conventional concrete applications with positive effects on sustainability (reduction of CO2 emissions, upcycling of residues).
Claims11
A method for producing a supplementary cementitious material (SCM) comprising:
- a) providing dredged sludge comprising at least 50 wt.% to at most 90 wt.% water, at least 0 to at most 60 wt.% dry matter-based (DM) coarse fraction, and at least 40 wt.% DM fine fraction;
- b) removing the sand fraction from the dredged sludge, thereby retaining the fine fraction of the dredged sludge, the fine fraction comprises less than 30 wt.% grains having a grain size larger than 63 μm;
- c) adding of portlandite (slaked lime, Ca(OH)2), or quicklime (CaO) to the fine fraction;
- d) dewatering of the fine fraction, thereby forming dried filter cake precursor;
- and,
- e) thermally treating the dried filter cake precursor.
Dependencies are inferred from the claim text.